I just tested your form and it seams to work for me.
Do not paste the code from your page into the message attach the php page to the message instead.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.